US11749985B2ActiveUtilityA1
Method and device for timing in time-varying distance protection based on multiple lines in tower
Assignee: CHINA ELECTRIC POWER RES INSTPriority: Jul 16, 2019Filed: Oct 31, 2019Granted: Sep 5, 2023
Est. expiryJul 16, 2039(~13 yrs left)· nominal 20-yr term from priority
Inventors:Zexin ZhouTianhua LiHong-Xi CaoYarong GuoXingguo WangDingxiang DuDelin WangPengfei LvZhi Zhang
H02J 2103/30H02H 7/263H02H 1/0061H02J 2203/20H02H 7/26H02H 1/0092H02H 3/40
49
PatentIndex Score
0
Cited by
21
References
11
Claims
Abstract
A method and device for timing in time-varying distance protection based on multiple lines of a tower. The method includes: collecting an instantaneous current value at a time-varying distance protection installation location in the multiple lines of the tower, and acquiring preset parameters; calculating, according to the preset parameters and a multi-line ranging model, a multi-line ranging result; calculating, according to the preset parameters, the multi-line ranging result, and an adaptive calculation model, time of a section-II distance protection action and final time of a section-III distance protection action; and determining, according to the instantaneous current value, the preset parameters, and a cross-line failure auxiliary criterion model, final time of the section-II distance protection action.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A method for timing in time-varying distance protection based on multiple lines of a tower, comprising:
collecting an instantaneous current value at a time-varying distance protection installation location in the multiple lines of the tower, and acquiring preset parameters;
calculating, according to the preset parameters and a multi-line ranging model, a multi-line ranging result;
calculating, according to the preset parameters, the multi-line ranging result, and an adaptive calculation model, time t II of a section-II distance protection action and final time t III of a section-III distance protection action; and
determining, according to the instantaneous current value, the preset parameters, and a cross-line failure auxiliary criterion model, final time t′ II of the section-II distance protection action.
2. The method of claim 1 , wherein the preset parameters comprise a distance protection ranging result C, a length C L of the multiple lines of the tower, and a number N of lines in the multiple lines of the tower, and a calculation formula of the multi-line ranging model is:
{
C
D
=
C
N
+
(
N
-
1
)
C
L
N
C
≥
C
L
C
b
=
C
C
<
C
L
where C D is the multi-line ranging result, and the N is a positive integer.
3. The method of claim 2 , wherein calculating, according to the preset parameters, the multi-line ranging result, and the adaptive calculation model, the time t II of the section-II distance protection action and the final time t III of the section-III distance protection action comprises:
calculating, according to the preset parameters, the multi-line ranging result, the adaptive calculation model, an intermediate action time value;
calculating, according to the preset parameters, the multi-line ranging result, the adaptive calculation model, and the intermediate action time value, the time t II of the section-II distance protection action and the final time t III of the section-III distance protection action.
4. The method of claim 3 , wherein the preset parameters further comprise a time range K 0 , a minimum time t min of the section-III distance protection action and a maximum time L III.set of the section-III distance protection action; there are six intermediate action time values in the adaptive calculation model, corresponding to the following six calculation formulas:
{
t
1
=
a
1
1
b
1
1
C
D
/
C
L
C
D
≤
e
1
1
C
L
t
1
=
a
1
2
b
1
2
(
C
D
-
c
1
2
C
L
)
+
d
1
2
C
D
>
e
1
1
C
L
;
t
2
=
a
2
1
C
D
-
c
2
1
C
L
;
{
t
3
=
a
3
1
b
3
1
(
C
D
-
c
3
1
C
L
)
d
3
1
C
L
≤
C
D
≤
d
3
1
C
L
+
e
3
1
t
3
=
a
3
2
d
3
1
C
L
+
e
31
<
C
D
;
{
t
4
=
a
41
b
41
(
C
D
-
c
41
C
L
)
d
41
C
L
≤
C
D
≤
d
41
C
L
+
e
41
t
4
=
a
42
d
41
C
L
+
e
41
<
C
D
;
{
t
6
=
a
6
1
C
D
-
C
L
C
L
≤
C
D
≤
C
L
+
e
6
1
t
6
=
a
6
2
C
L
+
e
6
1
<
C
D
where a 11 , a 12 , a 21 , a 31 , a 32 , a 41 , a 42 , a 51 , a 61 , a 62 , b 11 , b 12 , b 31 , b 41 , b 51 , c 12 , c 21 , c 31 , c 41 , c 51 , d 12 , d 31 , d 41 , e 11 , e 31 , e 41 and e 61 are all positive numbers.
5. The method of claim 4 , wherein in the adaptive calculation model, the formula for calculating the time t II of the section-II distance protection action is:
when 0≤C D ≤f 11 C L , t II =t 1 , and if t II g 11 , t II =g 11 ;
when
f
11
C
L
<
C
D
≤
f
21
C
L
,
t
II
=
(
t
1
+
t
2
)
K
0
h
21
,
if
t
II
<
g
21
,
t
II
=
g
21
,
and
if
t
II
>
h
22
+
t
2
,
t
II
=
h
22
+
t
2
;
when
f
21
C
L
<
C
D
≤
f
31
C
L
,
t
II
=
(
t
1
=
t
2
+
t
3
)
K
0
h
31
,
and
if
t
II
>
g
31
,
t
II
=
g
31
;
when
f
31
C
L
<
C
D
,
t
II
=
(
t
1
+
t
2
+
t
3
+
t
4
)
K
0
h
41
,
and
if
t
II
>
g
41
,
t
II
=
g
41
,
where f 11 , g 11 , f 21 , h 21 , g 21 , h 22 , f 31 , h 31 , g 31 , h 41 , and g 41 are all positive numbers.
6. The method of claim 5 , wherein the preset parameters further comprise a distance protection phase-selection result; and determining, according to the instantaneous current value, the preset parameters, and the cross-line failure auxiliary criterion model, the final time t′ II of the section-II distance protection action comprises:
in response to that the distance protection phase-selection result is an interphase failure, determining whether an interphase failure auxiliary criterion is satisfied; and in response to that the interphase failure auxiliary criterion is satisfied, keeping t′ II =t II unchanged, or in response to that the interphase failure auxiliary criterion is not satisfied, taking t′ II to be P seconds when t II P, where P is a positive number; or
in response to that the distance protection phase-selection result is a single-phase failure, determining whether a single-phase failure auxiliary criterion is satisfied; in response to that the single-phase failure auxiliary criterion is satisfied, keeping t′ II =t II unchanged, or in response to that the single-phase failure auxiliary criterion is not satisfied, taking t′ II to be Q seconds when t II Q, where Q is a positive number.
7. The method of claim 6 , wherein the cross-line failure auxiliary criterion model comprises an interphase failure auxiliary criterion model and a single-phase failure auxiliary criterion model;
the formula of the interphase failure auxiliary criterion model is:
{
|
I
.
f
φ
1
-
I
.
f
φ
2
|
|
I
.
f
φ
1
+
I
.
f
φ2
|
≥
η
I
.
f
φ
1
-
I
.
f
φ
2
I
.
f
φ
1
+
I
.
f
φ2
≤
λ
where İ fφ1 is a current fundamental phasor of one failed phase of the interphase failure; İ fφ2 is a current fundamental phasor of the other failed phase of the interphase failure; η is a first interphase coefficient, η>1; and λ is a second interphase coefficient, λ<1; and
the formula of the single-phase failure auxiliary criterion model is:
{
θ
1
≤
arg
(
I
.
φ
1
/
I
.
φ
2
)
≤
θ
2
I
.
φ
1
-
I
.
φ
2
I
.
φ
1
+
I
.
φ
2
≤
λ
where İ φ1 is a current fundamental phasor of a leading phase in healthy phases; İ φ2 is a current fundamental phasor of a lagging phase in the healthy phases; θ 1 is a first angle of a single phase; θ 2 is a second angle of the single phase, θ 2 >θ 1 >90°.
8. The method of claim 4 , wherein in the adaptive calculation model, the formula for calculating the final time of the section-III distance protection action t III is:
when 0≤C D ≤f 11 C L , t III =t 1 +t min +j 11 ;
when
f
11
C
L
<
C
D
⩽
f
21
C
L
,
t
III
=
(
t
1
+
t
2
)
K
0
j
21
+
t
min
-
j
22
,
if
t
III
<
k
21
+
t
min
,
t
III
=
k
21
+
t
min
,
and
if
t
III
=
k
22
+
t
6
+
t
min
,
t
III
>
k
22
+
t
6
+
t
min
;
when
f
21
C
L
<
C
D
⩽
f
31
C
L
,
t
III
=
(
t
1
+
t
2
+
t
3
)
K
0
j
31
+
t
5
(
C
D
-
j
32
C
L
)
j
33
+
t
min
-
j
34
,
and
if
t
III
>
k
31
,
t
III
=
k
31
;
and
when
f
31
C
L
<
C
D
,
t
III
=
(
t
1
+
t
2
+
t
3
+
t
4
)
k
0
j
41
+
t
5
+
t
min
-
k
41
,
and
if
t
III
>
L
III
.
set
,
t
III
=
L
III
.
set
;
after t III is obtained, if t III L III.set , t III =L III.set ; where f 11 , f 21 , j 21 , j 22 , k 21 , k 22 , f 21 , f 31 , j 31 , j 32 , j 33 , j 34 , k 31 , f 31 , j 41 and k 41 are all positive numbers.
9. A device for timing in time-varying distance protection based on multiple lines of a tower, comprising:
a parameter collection and acquisition component, connected to a multi-line ranging model component, an adaptive calculation model component and a cross-line failure auxiliary criterion model component respectively, and configured to: collect and acquire preset parameters and send the preset parameters to the multi-line ranging model unit, the adaptive calculation model unit and the cross-line failure auxiliary criterion model unit;
the multi-line ranging model component, connected to the adaptive calculation model component, and configured to: calculate, according to the preset parameters sent by the collection and acquisition parameter component and a multi-line ranging model, a multi-line ranging result, and send the multi-line ranging result to the adaptive calculation model component;
the adaptive calculation model component, connected to the cross-line failure auxiliary criterion model component, and configured to: calculate, according to the preset parameters, the multi-line ranging result sent by the multi-line ranging model component, and an adaptive calculation model, time of a section-II distance protection action and final time of a section-III distance protection action, and send the time of the section-II distance protection action to the cross-line failure auxiliary criterion model component; and
the cross-line failure auxiliary criterion model component, configured to: determine, according to the preset parameters, a cross-line failure auxiliary criterion model, and an instantaneous current value at a time-varying distance protection installation location in the multiple lines of the tower, a final time of section-II distance protection action.
10. The device of claim 9 , wherein the preset parameters comprise a distance protection phase-selection result, a time range K 0 , a length C L of the multiple lines of the tower, a number N of lines in the multiple lines of the tower, a distance protection ranging result C, a minimum time t min of the section-III distance protection action and a maximum time L III.set of the section-III distance protection action.
11. The device of claim 9 , wherein the cross-line failure auxiliary criterion model comprises an interphase failure auxiliary criterion model and a single-phase failure auxiliary criterion model.Cited by (0)
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